Married men who spend more time doing traditionally female household tasks—including cooking, cleaning, and shopping—report having less sex than husbands who don't do as much, according to a new study in the February issue of the American Sociological Review. "Our findings suggest the importance of socialized gender roles for sexual frequency in heterosexual marriage," said Sabino Kornrich, the study's lead author and a junior researcher at the Center for Advanced Studies at the Juan March Institute in Madrid. "Couples in which men participate more in housework typically done by women report having sex less frequently. Similarly, couples in which men participate more in traditionally masculine tasks—such as yard work, paying bills, and auto maintenance—report higher sexual frequency."